kernel/Documentation/ABI/testing/debugfs-dwc-pcie, branch linux-rolling-stable

PCI: dwc: Add debugfs property to provide LTSSM status of the PCIe link

2025-03-06T08:55:54Z

Add the debugfs property to provide a view of the current link's LTSSM status from the Root Port device. Signed-off-by: Hans Zhang <18255117159@163.com> Reviewed-by: Manivannan Sadhasivam Tested-by: Niklas Cassel Tested-by: Hrishikesh Deleep Link: https://lore.kernel.org/r/20250223141848.231232-1-18255117159@163.com [kwilczynski: commit log, refactor dw_ltssm_sts_string() to avoid compilation errors on platforms that do not set CONFIG_PCIE_DW_HOST] Signed-off-by: Krzysztof Wilczyński

PCI: dwc: Add debugfs based Statistical Counter support for DWC

2025-03-06T08:55:53Z

Add support to provide Statistical Counter interface to userspace. This set of debug registers are part of the RAS DES feature present in DesignWare PCIe controllers. Co-developed-by: Manivannan Sadhasivam Signed-off-by: Shradha Todi Reviewed-by: Manivannan Sadhasivam Tested-by: Hrishikesh Deleep Link: https://lore.kernel.org/r/20250221131548.59616-6-shradha.t@samsung.com [kwilczynski: commit log, tidy up code comments, update documentation, squashed patch that checks if the event counter is supported from https://lore.kernel.org/linux-pci/20250225171239.19574-3-manivannan.sadhasivam@linaro.org] Signed-off-by: Krzysztof Wilczyński

PCI: dwc: Add debugfs based Error Injection support for DWC

2025-03-06T08:55:53Z

Add support to provide Error Injection interface to userspace. This set of debug registers are part of the RAS DES feature present in DesignWare PCIe controllers. Signed-off-by: Shradha Todi Reviewed-by: Manivannan Sadhasivam Reviewed-by: Fan Ni Tested-by: Hrishikesh Deleep Link: https://lore.kernel.org/r/20250221131548.59616-5-shradha.t@samsung.com [kwilczynski: commit log, tidy up code comments, update documentation, change debugfs property name from "duplicate_dllp" to "duplicate_tlp"] Signed-off-by: Krzysztof Wilczyński

PCI: dwc: Add debugfs based Silicon Debug support for DWC

2025-03-06T08:55:47Z

Add support to provide Silicon Debug interface to userspace. This set of debug registers are part of the RAS DES feature present in DesignWare PCIe controllers. Co-developed-by: Manivannan Sadhasivam Signed-off-by: Shradha Todi Reviewed-by: Manivannan Sadhasivam Reviewed-by: Fan Ni Tested-by: Hrishikesh Deleep Link: https://lore.kernel.org/r/20250221131548.59616-4-shradha.t@samsung.com [kwilczynski: commit log, tidy up Kconfig and drop "default y", tidy up code comments, squashed patch that fixes a NULL pointer dereference when debugfs is already unavailable during clean-up from https://lore.kernel.org/linux-pci/20250225171239.19574-2-manivannan.sadhasivam@linaro.org, refactor dwc_pcie_debugfs_init() to not return errors, squashed patch that changes how lack of the RAS DES capability is handled from https://lore.kernel.org/linux-pci/20250304151814.6xu7cbpwpqrvcad5@thinkpad] Signed-off-by: Krzysztof Wilczyński